Sato, Akira
Kayama, Hisako
Shojima, Kensaku
Matsumoto, Shinji
Koyama, Hirofumi
Minami, Yasuhiro
Nojima, Satoshi
Morii, Eiichi
Honda, Hiroaki
Takeda, Kiyoshi
Kikuchi, Akira
Article History
Received: 9 December 2014
Accepted: 23 April 2015
First Online: 1 June 2015
Competing interests
: The authors declare no competing financial interests.